9. Comparison and development of different techniques

9.1 Fields of application

Today, in the LV field, airborne magnetic cut-off is, except in a few rare cases, the only one used.

In HV and EHV, the SF ₆ cut-off technique is practically the only one used.

For MT, where all techniques can be used, those of cutting in SF ₆ and in vacuum have replaced those in air, for reasons of cost and size (figure 30 ), and those in oil, for reasons of reliability, safety and reduced maintenance (table...